Le Roy (also styled "LeRoy") is a city in McLean County, Illinois, United States. The population was 3,560 at the 2010 census.
LeRoy was laid out on 28 November 1835 by Asahel Gridley (26 April 1810 – 25 January 1881) and Merritt L. Covell (30 January 1808 – 17 September 1847). The founders were Bloomington businessmen. They had served together in the Black Hawk War, Covell as a captain and Gridley as a lieutenant. Because of their brief service both men were popularly called "General". Both would later serve in the Illinois General Assembly, and Gridley would eventually become McLean County's first millionaire.